Four students are given an assignment to find out what they could do to make a reaction between hydrochloric acid (HCl) and zinc (Zn) follow the Law of Conservation of Mass. The students execute a controlled experiment and collect the data in the chart. Which student’s idea would improve the experimental design such that the results would more accurately demonstrate the Law of Conservation of Mass?

Student 1 states that they should add more zinc to the reaction to increase the mass of the products.

Student 2 states that they should decrease the amount of acid to decrease the mass of the products.

Student 3 states that they should put a balloon over the top of the flask to close the system.

Student 4 states that they should add ice to the reaction to stop the reaction from boiling the acid away.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

Which statement best compares aerobic and anaerobic respiration